runtime: fix panic if newstack at runtime.acquireLockRank

Process may crash becaues acquireLockRank and releaseLockRank may
be called in nosplit context. With optimization s and inlining
disabled, these functions won't get inlined or have their morestack
calls eliminated.
Nosplit is not strictly required for lockWithRank, unlockWithRank
and lockWithRankMayAcquire, just keep consistency with lockrank_on.go
here.

Fixes #40843

Author: chainhelen

src/runtime/lockrank_off.go

@@ -18,19 +18,24 @@ func getLockRank(l *mutex) lockRank {
 	return 0
 }
 
+//go:nosplit
 func lockWithRank(l *mutex, rank lockRank) {
 	lock2(l)
 }
 
+//go:nosplit
 func acquireLockRank(rank lockRank) {
 }
 
+//go:nosplit
 func unlockWithRank(l *mutex) {
 	unlock2(l)
 }
 
+//go:nosplit
 func releaseLockRank(rank lockRank) {
 }
 
+//go:nosplit
 func lockWithRankMayAcquire(l *mutex, rank lockRank) {
 }